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Finding the Fourth Proportional to 1,129.80, 1,697.12 and 765.32

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Solution

The fourth proportional to 1,129.80, 1,697.12 and 765.32 is: 1,149.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.80 : 1,697.12 = 765.32 : x
  2. Step 2: Convert to fraction form
    1,129.80/1,697.12 = 765.32/x
  3. Step 3: Cross multiply
    1,129.80x = 1,697.12 × 765.32
  4. Step 4: Simplify right side
    1,129.80x = 1,298,839.88
  5. Step 5: Solve for x
    x = 1,298,839.88/1,129.80
  6. Step 6: Final answer
    x = 1,149.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.